Sass Function and Styles to make awesome animated snow

snow.sass

@function makeSnow($n) 

  $value: '#{random(2000)}px #{random(2000)}px rgba(255, 255, 255, .9)'
  @for $i from 2 through $n
    $value: '#{$value} , #{random(2000)}px #{random(2000)}px rgba(255, 255, 255, .9)'

  @return unquote($value)

$snow-small: makeSnow(700)
$snow-medium: makeSnow(500)
$snow-large: makeSnow(300)

.snow
	position: absolute
	top: 0
	left: 0
	border-radius: 50%
	&--small
		width: 1px
		height: 1px
		background: transparent
		box-shadow: $snow-small
		animation: animSnow 50s linear infinite
		&:after
			content: " "
			position: absolute
			top: 150vh
			width: 1px
			height: 1px
			background: transparent
			box-shadow: $snow-small
	&--medium
		width: 2px
		height: 2px
		background: transparent
		box-shadow: $snow-medium
		animation: animSnow 75s linear infinite
		&:after
			content: " "
			position: absolute
			top: 150vh
			width: 1px
			height: 1px
			background: transparent
			box-shadow: $snow-medium
	&--large
		width: 3px
		height: 3px
		background: transparent
		box-shadow: $snow-large
		animation: animSnow 100s linear infinite
		&:after
			content: " "
			position: absolute
			top: 150vh
			width: 1px
			height: 1px
			background: transparent
			box-shadow: $snow-large
 
@keyframes animSnow
  from	
    transform: translateY(-50vh)
  to		
    transform: translateY(100vh)